readAsBinaryString

The readAsBinaryString method is a function associated with the FileReader API in web development. It is used to read the contents of a File object as a raw binary string. This means that the file's data is represented as a sequence of characters, where each character's code point corresponds to a byte value in the file. This method is particularly useful when you need to process the binary data of a file directly, such as for cryptographic operations, file format analysis, or when you need to transmit the file's contents as a string representation.

When you call readAsBinaryString on a File object, the FileReader object begins reading the file asynchronously. Once the reading operation is complete, the result of the operation can be accessed through the FileReader's `result` property. This `result` will be a string containing the binary data. It's important to note that while it's called a "binary string," it is still a string in JavaScript. However, each character in the string represents a single byte of the original file. This method is now considered obsolete and has been deprecated in favor of readAsArrayBuffer or readAsDataURL, which offer more robust and modern ways to handle binary data.